# NPK Calculator vs BudLabs

The clearest difference is price: BudLabs at Free against NPK Calculator's $2.99. BudLabs also leads on ratings volume (77 vs 8) and iOS requirement (13.0 vs 18.5). On rating, review sentiment, update cadence and ads there is nothing between them.

BudLabs is free to download; NPK Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 3.3 for NPK Calculator against 3.2 for BudLabs. That said, the two scores are not equally well evidenced: BudLabs has 77 ratings behind it against 8, so its average is the more settled of the two. Written reviews are what separate them: 33% of NPK Calculator's written reviews are positive against 36% of BudLabs's.

NPK Calculator ships an update monthly, BudLabs every 2 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | NPK Calculator | BudLabs |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.3 (8 ratings)](https://appshunter.io/ios/app/npk-calculator/id988554060/reviews)** | [3.2 (77 ratings)](https://appshunter.io/ios/app/budlabs/id1174388506/reviews) |
| Number of ratings | 8 | **77** |
| Positive reviews | 33.3% of reviews | **36.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 2 months |
| Monetization | Paid | **Free** |
| Size | 3 MB | 36 MB |
| Requires iOS | 18.5 | **13.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Anton Simonov](https://appshunter.io/developer/988554059) | [Advanced Nutrients](https://appshunter.io/developer/1223498164) |

## What reviewers say

### NPK Calculator

[App page](https://appshunter.io/ios/app/npk-calculator/id988554060)

This app helps optimize fertilizer solutions for plants by calculating the correct ratios of macronutrients and micronutrients. It aims to save money, prevent nutrient imbalances, and improve nutrient uptake for healthier plant growth in hydroponics or soil.

**Highlights:** Optimizes macronutrient and micronutrient ratios, Database of fertilizers, Nutrition programs from experienced growers, Saves money on fertilizer solutions, Prevents fertilizer burns and nutrient lock-out, Optimizes nutrient uptake

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### BudLabs

[App page](https://appshunter.io/ios/app/budlabs/id1174388506)

This hydroponics grow guide helps growers of all levels organize their cultivation process. It provides tailored feeding schedules with precise nutrient proportions and allows users to manage multiple virtual crops, track progress, and access product information.

**Highlights:** Tailored feeding schedules, Nutrient calculator, Manage multiple virtual crops, Track crop growth phases, Task management and notes, Advanced Nutrients product info, Retailer locator

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Helpful for tracking grows
- 👍 Calculates nutrient needs
- 👍 Easy to use calculator
- 👍 Good for beginners
- 👍 Useful for experienced growers

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 App freezes often
- 🐛 App does not work
- 🐛 Useless for autos
- 🐛 Nutrient ratios are wrong

**Reported bugs**

- App crashes
- App freezes
- App does not work
- App not opening
- App under maintenance message

**Requested features**

- Ability to input pH and PPM
- Grower suggestions for adjustments
- All grow info in one place
- Edit or delete entries on to-do list
- Support for autoflower community


## Frequently asked questions

### Is NPK Calculator free?

NPK Calculator costs $2.99, with no in-app purchases.

### Is BudLabs free?

BudLabs is free to download, with no in-app purchases.

### Which has better reviews, NPK Calculator or BudLabs?

NPK Calculator is rated higher. NPK Calculator averages 3.3 out of 5 from 8 ratings, while BudLabs averages 3.2 from 77 ratings.

### Do NPK Calculator or BudLabs have ads?

Neither NPK Calculator nor BudLabs shows ads.

### Which is updated more often, NPK Calculator or BudLabs?

NPK Calculator ships an update monthly, and BudLabs every 2 months. Most recently, NPK Calculator was updated on November 1, 2026 and BudLabs on November 2, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*